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A pregnant woman told zoo staff that she was injured when one of the two female gorillas, named "Praline," hurled a block of wood and struck her in the head, The Associated Press reported.

The pregnant woman said she fell on her stomach and spent hours being treated at two hospitals. Zoo staff said first responders immediately attended to the woman.

The Audubon Nature Institute said Tuesday it is in contact with the woman and is assisting her with her medical care. Officials said the safety of guests and employees is of utmost concern and staff are examining how the incident happened.

Officials explained the block of wood was an enrichment object for the gorillas and had small holes in it for food and treats. Enrichment objects can be new food items, objects to manipulate and activities designed to provide animals with "species-appropriate behaviors, whether it be foraging, exploring, playing or other activities."

"Our enrichment program is in keeping with the Associated of Zoos and Aquariums and USDA standards," the Audubon Nature Institute said. "The incident has been reported to the AZA accreditation commission for review as per standard protocol."

The zoo said it will address any necessary concerns.

The Audubon Zoo is a popular tourist destination in New Orleans, with more than 800,000 visitors every year, the AP reported.